Stripper box



Oct. 21 1924. 1,512,018

P. P. FRAZER v STRIPPER BOX l Filed Sept. l1 1922 ws momma.

Patented Oct. 21, 1924.

UNITED STATES PINKNEY P. FRAZER, OF ST. LOUIS, MISSOURI.

STRIIPER BOX.

Application filed September 11, 1922. Serial No. 587,323.

To all 'whom t may concern:

Be it known that I, PINKNEY l?. FRAZER, a citizen of the United States, residing in the city of St. Louis and State of Missouri, have invented certain new and useful lmprovements in StripperBoXes, of which the following is a specification.

This invention relates to stripper boxes for foundry purposes and has for its object to hold together in relative position, the refractory materials constituting a single or a nest of molds, preventing the casting from scabbing when the metal is poured, and to overcome the strain of the moltenv metal, eliminating the distortion of corners and the injuring of the mold.

Another object of my invention is to provide a temporary holding mechanism of such a nature as to be easily tripped or released at the intended time and being of a simple and efficient structural formation and combination of parts in a combined unit, adapted for ready and substantial connection.

Other and incidental objects will appear as the description proceeds and in the drawing wherein I have illustrated the preferred embodiment of the invention, and wherein similar reference characters designate corresponding parts throughout the several views: Invthe drawings,

Fig. 1, is a perspective view of an assembled stripper box.

Fig. 2, is a reduced perspective view of the detached fra-me parts uniting the hinged parts and the rectangular top portion.

Fig. 3, is a reduced perspective view of the clamping frame.

Fig. 4, is a reduced perspective view of the cope and drag formation in a mold.

Fig. 5, is a reduced vertical section of a nest of molds for multiple castings.

Fig. G, is a modification of the beveled clamping slide showing the same integral with the side holding frame portions.

The essential features in foundry practice for the impression of patterns, consist mainly in the maintenance of the parting lines to hold the same together in a relative position to prevent unsound castings. The present methods prevailing to obtain these objects have proved inadequate in their provision for linear maintenance and it often occurs that the frame parts mainly used in molding operations and constituting the most important appliances, had a sideway springing tendency injuring the mold.

I have overcome these obstacles in my device by constructing a stripper box, especially adapted for multiple castings, comprising a connected main frame consisting of parallel spaced side members 1, Q, 8 and 4, said side members being composed ofl quadrantal sections, each section on the opposite side being hinged to one another, as shown at 5 and 6, comprising a composite construction adjustable as a unit.

Located at a position approximately midway on the side holding frame portions 1, 2, 3 and 4, are outwardly projecting, longitudinally disposed clutch members 7 of a beveled formation having theiriecluced portions 8 of said bevel 7 located at the upper terminals et the side holding frame members 1, Q, 3 and 4, and being integral with the same. Meeting in edgewise abutting contact and in angular alignment with the clutch member 7, are brackets 9 with looped portions 1() rigidly fastened to the side'frame members 1, 2, 3 and 4, said brackets 9 projecting horizontally over the reduced portion 8 of the clutch member 7 in the sufficient space in 'the internal projection to receive the slidable interfitting member 11 yin its ascending position indicating the point of termination.

The slidable interiitting member 11 consists of rectangular bar arms constructed and arranged to kcompletely embrace the frame portions 1, 2, 3 and 4 and slidably engage the outer surface of the beveled clutch member 7 simultaneously in the same direction along parallel paths and in a plane at right angles to each other.

Briefly stated, the operation of my device is as follows:

The oppositely disposed Vvhinged. frame members 1, 3 and 2, 4 with their interconnecting partition edges 1G and 17 are wedged together to form a rectangular shaped container. rlhe compression member 11 being angularly shaped and in parallel alignment with the side holding frame portions 1` 2, 3 and 4, is then dor-.inwardly pressed in edge abutting contact with theV outer beveled surface of the clutch member i' holding the frame portions 1, 2., 3 and 4 in tenacious engagement with each other` so that the cope 13 abutting with its inner surface against the the drag 14 can receive, through its refractory material, the impression of the pat tern, holding the parting lines against linear or angular' displacement, and allow the molten material, when poured into the gatestitch or basin 15 to completely fill all contours of the pattern without distortiwir any lines ot the same.

In disengaging the trame portion-s ot' the stripper boX from an operative into an inoperative position, the compression i'nen'ilier ll is pressed forward ascending against the bracket 9 and allowing the trame portions to disengage the edge abutting partitions 'i6 and 17. The side holding traine portions l, 2, 3 and 4 can then bev collapsed and the compression member l1 removed.v

In Fig. 2, a modiiication in the structural elements of the stripper' boi; are shown where the hinged parte 5 and 5 are bracket stop devices 9 are omitted, having the edge ahnt ting terminals oic the side holding` frame portions l, Q, 3 and 4 in rigid engagement with each other to receive the compression me ber l1 in the same iniictionary nanner as aforedescribed.

In Fig. 5, the vertical section ot' a stripper box conclusively shows the advantages of uniform clamping means for multiple castings where 15 represents the basin to receive the molten metal, 1G the runnerdistributing said metal into the nest of forms 18, The compact arrangement Vot the component part-s in relation to the trame portions of the stripper box is clearly seen in this vertical section', wherejall forms oit distorting elements are obliterated.' 'Y Y Fromthe foregoing description taken in connection with the accompanying drawing. the advantages of the construction and ot the method o1 operation will be readily apparent to those skilled in the art to vwhicl'i the invention appertains and while I have described the principles ot operation ot the invention together with the device which I now consider to be" the best embodiment thereof, I desire to have it understood that the device shown is merely illustrative and that such changes may be made as are within the scope of the claimed invention.

What I claim is:

l. In a stripper boX, the combination with a receptacle, divided into quadrantal de-l tachable sections of oppositely7 disposed frame members, the sections on opposite sides 'being hinged to one another, each pair ot hinfged sections being adjustable as al unit. means for holding` the hinged sections in a, given relation to the tace plates ofthe quadrarntal sections.

2. In a stripper box, the combination with receptacle, divided into quadrantal sec-Y Y along parallel paths and in a planeat right angles to each othen'saidclamping member consis ing ot an ontw fily projecting rec# tangular band casing ot composite construction, movable intogand out of operative position.,A a series oi bevel snaped clutch members on each side ot' the trame plates, said clutch members being operatively associated with the clamping member' in edge abutting contact, brackets rigidly fastened tothe edge terminals of the" iframe plates., the'ex'tremitie's ot said brackets being outwardly bent and adapted for insertion oit the pressureoperf movement,

tion inemr sand said diagonally opposite or" eachl other, the 'other two diagonally oppositie corners vbeing noir hinged, and mea-ns for hol-ding thehing'e'd sections in their closed positionfand inen'; gagement with the side faces ofthe sand mold. f In a stripper box construction Ytorsand molds, a VquadrantalV receptacle f'hingedly united at two diagonally 'opposite corners only, and mea-ns tor closingA said sections into contact with the side faces-ot al sand mold and holding the-sections in their closed in position, sai-d means also serving to permit expansion of the quad'rantal sections for releasingA same fromv the sand mold.v

6.' In an expansible stripper box construction for sand molds, a pair of qu'adrantal detachablel sections, the face plates Vot each quadrant being hinged to each otherV in' dia-v gonally opposite relation, a-bevelpl'atelixed to each 'face pla-te anda clamping rin'g'adapted for pressure engagement with thebevel plates tor closingY the .face plateso ,each quadrantal section into engagement vwith'the side tace of a sand mold. y l

7. In an ,expansible' stripper box construction for sand molds, a pair ot quadrantal de` ico tachable vface plate sections. hingedly united in diagonally opposite relatiomandineans Jtor closing the quadrantal sections into engagement with theside Vfaces ofthe sand mold. Y a

In testimonywhereof, I have hereunto signed my nameto the specification. i

PINKNEY r. rnaznn. 

